ensure that they obtain the arms they need to defeat assad's tanks and helicopters and fighter jets. >> reporter: romney's aide saying romney is not suggesting the u.s. arm the rebels directly. president obama has opposed providing weapons to the rebels partly out of concern that those weapons could wind up in the hands of terrorists. on iran mitt romney earlier this year saying this. >> if we re-elect barack obama, iran will have a nuclear weapon. >> reporter: but today was unclear what exactly romney would do that would be different. the obama administration imposing tough sanctions already. >> i will not hesitate to impose new sanctions on iran and will tighten the sanctions we currently have. >> reporter: the obama campaign asking just what would those new sanctions be, and on libya after the attack in benghazi that killed four americans including ambassador chris stevens, blistering words today from romeny for the obama administration. >> this latest assault can't be blamed on a reprehensible video insulting islam despite the administration's attempts to convince us of that for